Hook and holder for extension-ladders.



No.- 755,190. PATENTED MAR. 22, 1904.

J. S. TRIPP, DEGD.

L. J. TRIPP a; r. M. EH08, EXBIGUTORS.

HOOK AND HOLDER FOR EXTENSION LADDERS.

APPLICATION FILED JULY 10. 1908.

H0 MODEL.

} Exacutavs- Est s mums Ptrzks cu.warourno,.wnsum01cv n c 25 locking device.

UN TED STATES Patented March 22, 1904. A

PATENT OFFICE."

LUCY J. TRIPP AND FRANK M. ENOS, ROCHESTER, NEW YORK, EX- ECUTORS OF JAMES SMITEN TRIPP, DECEASED.

HOOK AND HOLDER FOR EXTENSION-LADDERS.

LJFECIFICATION forming part of Letters Patent No. 755,190, dated March 22, 1904.

Application filed July 10,1993. Serial No. 164,984. (No model.)

New York, are executors, did invent new and,

useful Improvements in Hooks and Holders IO for Extension-Ladders, of which the following is a specification.

This invention relates to certain improvements in automatic locking devices for the sliding sections of extension-ladders and in I means for connecting same with a ladderladder, as is hereinafter fully explained, so

that the ladder may be lengthened or shortened, as desired.

Referring to the drawings, Figure 1 is aperspective view of two ladder-sections and the Fig. 2 is a perspective view from the inner side of the locking-device holder. Fig. 3 is a side view of the locking device and holder. Fig. 4 is a rear View of the locking device, and Fig. 5 an edge View of the trip-latch.

On the drawings, the letters A Bdesignate two sections of an extension-ladder, and C C the rungs thereof.

The locking devices and holders are intend- 3 5 ed to connect with the sliding section of the ladder and either used single or in pairs. Thus for light work there is employed but one looking device and holder, the same being secured to either the right or left rail of the sliding 4 section, while for heavy ladders one is applied to each rail in such manner that their hooks may engage the same rung of the ladder-section beneath same.

The holder D consists of a T-shaped plate,

the top members of which are each provided with stop-arms c c and the lower member with a bolt-opening F and a bearing-plate g. The stop-arms and bearing plate are of equal lengths and each is provided with a point for 5 O penetrating the ladder-rail, and thus the said the ladder.

plate adjusts itself parallel with the side of V the rail.

The locking device H consists of a pivotal bar 2, having a' rearwardly-projecting eye 2" at its lower end and having near its upper end a hook portion in for engaging the rungs ofa ladder. A curved slide Z extends upward and rearward from the point of the hook, and a lug m is formed in rear of the hook-recess. This lug and a portion of the locking-bar below same is provided with a central slot or opening n, within which the trip-latch O is suspended by a pin p, so that the front end of the trip-latch maywhen swung forward strike against the point of the hook. The trip-latch has a curvilinear edge and provided at its forward end with side pins q q to prevent its being forced out of the locking-bar slot when impelled backward. To strengthen the upper part of the locking-bar, the rear of the slide and hook is provided with a central rib 7, which terminates in the lug at the back of the hook, as clearly shown in the drawings.

In the application of the improvements to ladders the holder Dis first placed in the desired position with its points against the inside of the rail of the sliding ladder-section. By pressure the points are embedded in the rail and theT-plates assume a position parallel with the surface of the rail. The lower end of the locking device is thenpassed downwardly between the stop-arms of said plate with the hook inclined toward the rungs of A suitable bolt is next inserted into the hole of the plate and eye of the locking-bar. The end of the bolt is then screwed into the ladder-rail or passed through a hole therein and is thus secured either by a screwnut or any other well-known means for so doing. To insure the pressing forward of the hook, a spring 2? is connected with the holderstud, in the rear thereof, as shown in Fig. 3 of the drawings.

Having described the invention, what is claimed as new, and desired to be secured by Letters Patent, is g 1,. Inextension-ladders, a hook-supporting frame comprising a T-shaped plate, the upper members of the plate provided'with stop-arms and the lower member with a bolt-opening and a bearing-plate, the stop-arms and bearingplate of equal lengths; the stop-arms provided with points to engage the rail, substantially as set forth.

2. In extension-ladders, a hook-supporting frame comprising a T-shaped plate, the upper members of the plate provided with stop-arms, and the lower member with abolt-opening and a bearing-plate, the stop-arms and bearingplate of equal lengths and each provided with points, whereby in applying the plate to the side of a ladder-rail, the said plate Will adjust itself parallel therewith, substantially as set forth.

3. In extension-ladders, the combination of a T-shaped holder provided at one side with a pair of stop-arms and a bearing-plate each having a pointed end, a bolt-opening in the lower member of the plate, a bolt adapted to fit there- LUCY J. TRIPP, FRANK M. ENDS, Eweoutms 0 f the estate 0 f James Snm'tm Tripp,

deceased.

Witnesses:

HAROLD R. ADAMS, HENRY A. WOOD. 

